Flying roof on floor slabs

Of course! For your article on "Flying Roof on Floor Slabs," here is a quick synopsis:

Regarding contemporary architecture and structural engineering, the idea of a "flying roof" over floor slabs embodies a harmonious combination of practicality and visual appeal. Flying roofs create eye-catching overhangs and shaded areas because they extend beyond the building’s perimeter, in contrast to traditional roof designs that rest directly on supporting walls.

A flying roof’s engineering entails support and placement that are carefully considered. These roofs achieve the illusion of floating by using cantilevered beams or columns in place of just walls for support. In addition to fostering architectural creativity, this design protects external walls, offers shade, and makes larger open spaces possible without the need for extra supporting walls.

Flying roofs are a common tool used by architects to seamlessly integrate outdoor and indoor areas. These roofs provide covered outdoor areas that blend in with interior spaces, promoting a connection with nature while providing shelter from the elements. They do this by extending beyond the building’s walls.

A flying roof’s structural design necessitates careful consideration of the materials and load-bearing capacities. Engineers have to make sure that the columns or beams supporting the roof are strong enough to support the weight of the roof plus any extra weight from the wind or snow. In order to preserve the building’s structural integrity and guarantee its longevity and safety, careful planning is essential.

All things considered, the idea of a flying roof represents a breakthrough in architectural design, providing both practical advantages and visual appeal. These roofs transform our perception of and interactions with built environments by stretching beyond conventional boundaries and defying convention, resulting in spaces that inspire and endure.

On what floors can hut roofs be placed?

Slabs of concrete flooring

We’ll talk about how to construct a holly roof on concrete floor slabs in this article. You should first become familiar with the general technical specifications of these kinds of roofs.

Technical parameters of hip roofs

Like any building structure, the roof of the hut has advantages and disadvantages. Only after carefully examining the features of the project, your preferences, and the characteristics of the structure can you decide on the type of roof. As was previously indicated, the hip roof is technically far more complex than a gable roof; only skilled roofers, working from the house project’s working drawings, are able to construct such a design.

What advantages does this type of roof offer? There are various variations of the rafter system, ranging from the straightforward classic four-sloping to the intricate Danish Valmova.

Danish holly roof

The range of applications for the structure is greatly increased by such a variety of technical solutions. Holly roofs also enable the rafters’ overhang to be extended, which allows for the creation of awnings that shield the facade walls from the damaging effects of atmospheric precipitation.

Retractable roof with a visor

Depending on the direction of the predominant winds in the area, the hip roof can be completely symmetrical, which simplifies the choice of the building’s construction site.

One option for the hip roof is total symmetry.

The small attic space, high estimated cost, and technical complexity are the drawbacks. By the way, hip roofs are very seldom attacked as a result of this.

Examining the "Flying roofs on floor slabs" phenomenon makes it clear that roof failures can seriously jeopardize occupant safety and the structural integrity of buildings. This article explores the causes of these incidents, which include construction errors, design flaws, and environmental factors like wind loads. We can better appreciate the significance of sound structural engineering practices and routine maintenance in preventing roof detachment and its possible consequences by knowing these underlying causes.

Councils on the construction of a holm roof on the floor slabs

Holly roofs, as previously indicated, have to bear heavy loads, and the length of the rafter legs indicates that there should be extra intermediate vertical or corner supports. These legs’ lowest point rests on a concrete overlap, which greatly raises the overlap’s strength requirements.

In conclusion, strength, dependability, stability, and longevity can only be ensured by carefully constructed, high-quality floor slabs. When you are building a box for a house, this is something you should take care of. The rafter system’s construction is greatly simplified if the overlap satisfies all current requirements.

You should pay closer attention to the overlap of the concrete pouring in the attic during the preparatory stage to avoid issues during the assembly of the rafter system.

Step 1: Lifting formwork to create a solid floor.

Due to the substantial weight of the concrete slab, the maximum load plus a margin should be computed for all supporting components. It is important to always keep in mind that the stove will require significant effort from the hollow roof in addition to its own weight, so the structure needs to be able to support the weight without any issues. Not just static, but dynamic with multiple directions as well.

The formwork needs to be sturdy, rigid, and steady. It is not crucial if mistakes are made when pouring concrete walls. In the worst situation, the wall’s surface is slightly distorted; in the best case scenario, it is closed, smooth, and unaffected. The same mistakes that happen when the floor slabs are filled in can lead to their total devastation. This is not the worst option if the structure collapses during the formwork disassembly process. Worse when the slabs become incapable of supporting weight during building operations or after a holly roof is constructed.

The formwork is constructed from wooden beams with 100 x 100 mm vertical supports and 50 x 100 mm horizontal boards.

The exact step depends on the thickness of the formwork’s lumber. The distance between the boards is roughly 60 cm. To prevent spreading in the lower part, all racks must be positioned strictly vertically and level. Additionally, they must be fixed together with different board segments. Racks should be spaced such that the total weight of each element is no more than 500 kg.

Underneath the formwork, more connections

Sensible guidance. It is advised to add more connections to vertical racks at a height of approximately half in order to strengthen their stability. This technique allows for a roughly 30% increase in the structure’s stability.

Used boards about 100 mm wide and 25 mm thick can be used for formwork. Avoid nailing every board; instead, address the extremes and fill in the middle without being naive. This greatly streamlines the process of removing the formwork after the floor slab has solidified, without compromising the structural integrity of the building.

It is not necessary to attain an ideal density between the boards; small fissures will seal with plastic wrap. Much better, quicker, and easier.

Planks arranged atop beams

Choose a plate thickness that works well with the architecture of the house; in this case, a 20 cm thick plate works well. The stairs leading to the attic should be chosen in the same way.

Sensible guidance. Drawing from the formwork’s shifts along the interior partition placement line is highly advised. When installing electrical cables and other components of engineering systems, this plan will be necessary.

Interior partition placement lines

A staircase opening

Creating an encircling belt is step two. Place pieces of polyethylene film (you can purchase the least expensive ones; it makes no difference) on the formwork. The construction reinforcement of the periodic profile with an Ø of 8 mm is required for reinforcement. Use any lining to elevate the reinforcement above the plate’s surface. It is advisable to promptly install holes in any areas where the stove may have electric cable passages or ventilation holes. Compared to hammering a solid concrete overlap, this is far simpler.

Cables for electricity are installed.

Strengthening the area surrounding the aperture

It is important to pay particular attention to the facade slabs and walls. Metal rods that are bent and fastened to a zone of reinforcement should be present in the walls.

Device for bending armor

Step 3: Concrete can be poured into the first section once the reinforcement has been installed. Preparing overlapping slabs in sections rather than the entire area at once is considerably simpler. Why?

  1. There is no need to constantly walk on the stacked reinforcement. Only the area that is first planned for filling is reinforced. Walking on a reinforcing belt is very uncomfortable and dangerous. In addition, there is a probability of changing its spatial position, which very negatively affects the strength of concrete overlap. The fact is that the reinforcement only then works to the maximum, when there are approximately five centimeters of concrete from all sides. If this layer is thinner, then the strength of the plate drops noticeably. We have already talked about how important it is to adhere to the technology of pouring the floor slab, what large loads act on it and what sad consequences can arise due to the destruction of integrity.
  2. It is much easier to serve concrete. If the solution is made and fed manually, then to facilitate the work you need to have a large free site in area.
  3. Easier to plan time. It is extremely advisable to fill the entire plate immediately if this is not done that the strength of the structure is significantly reduced. During the preparation, the size of the site can be chosen taking into account labor productivity and weather conditions. The stove will turn out to be strong, perfectly compacted and even.

There is flooding in the first strip.

There isn’t much accuracy required when aligning concrete with a rule or a gladel. The tolerance allows for a height variation between the corners of the house of up to two centimeters. Concrete proportions are one part cement to four parts gravel and two parts sand, plus water as needed.

It is advised to leave a specific recess in the side to strengthen the clutch between two independently filled concrete floor slabs. It is very easy to assemble: a 50 × 50 mm beam is nailed in the center of the dividing board. He’ll leave the first plate’s groove open, and the spike will pour new concrete into the second plate. The same algorithm indicates that you must fill the entire attic overlap area.

Formwork design: an extra board that is fastened from the interior

The following strip is overrun with water.

Pour all around the aperture.

Vital. After pouring the final site, you have only two weeks to disassemble the formwork.

The floor should be moistened with water at least twice a day, in the morning and the evening, if the weather is exceptionally warm and windy. It is preferable to apply a film to wet concrete during the day. Why is it required to be done? Cement chemical reactions are required for concrete to gain strength, and they can only occur in the presence of moisture. The strength of the concrete slab will never match the estimated values if there is insufficient water because the cement will stay cement and crumble after drying.

On the floor slabs below

A vent hole located in the floor slab

Pipes for communications and the boiler pipe

Retaining structure removed from balcony floor slabs

Brus prices


Comprehending the workings of a flying roof above floor slabs is essential for both builders and homeowners. The phenomenon wherein a building’s roof structure separates from it due to severe weather or structural failures is dangerous and necessitates careful planning in both design and upkeep.

A flying roof may be structurally caused by a number of things, such as insufficient structural support, strong winds, or poor building methods. When a roof blows up, people nearby may be seriously injured and significant property and infrastructure damage may result.

The implementation of preventive measures is crucial in reducing the potential hazards linked to flying roofs. Robust structural designs that take wind uplift forces into account and guarantee a roof’s secure attachment to the underlying walls or floor slabs are required by appropriate building codes and regulations. It is crucial to conduct routine maintenance and inspections in order to find potential weaknesses and fix them before they become safety concerns.

Knowing the dangers of flying roofs highlights for homeowners how crucial it is to maintain their roofs proactively and to have them inspected on a regular basis. The possibility of structural failures during inclement weather can be considerably decreased by making sure that roof structures are correctly fastened and maintained.

To sum up, solving the problem of flying roofs calls for an all-encompassing strategy that incorporates good engineering practices, observance of building codes, and preventative maintenance techniques. Stakeholders can reduce risks and improve the longevity and safety of buildings by comprehending the causes and putting preventive measures in place.

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Alexandra Fedorova

Journalist, author of articles on construction and repair. I will help you understand the complex issues related to the choice and installation of the roof.

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